Switch-lock.



W. E. WOODHOUSE 6a T. BATH. SWITCH LOCK.

A'PPIJGATION FILED JULY l1,`1910. www@ A Patented Ma?. 28, 191i.

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A. represent: suppmfcd ing tumbler 18 from the slot 12 and leaves the turning member free to turn, and it may then be turned by the switchman. As soon as it has been turned a short distance, however, it will be impossible for the tumbler to move backwardly, because the slot 12 will be `out of registration therewith, and the tumbler thus being held in outermost position, -it will be impossible to turn the key to release the same, and consequently the key cannot be removed until the turning member is brought back to its original position, when the switch will be in closed position.

y It will thus be seen that we have devised a very simple and effective lock well adapted to perform the functions required of it, and which will eifectua'lly guard against the carelessness of switchmen in leaving the switch in open position. Further, vthe .invention provides a very ready means of checking switchmen, because each switchman is provided with a marked key, and-on a switch being left unlocked, the key must remain therein, and this will identify the switchman who is responsible for leaving the switch in unlocked position.

It is of course evident that the loclr may` be located in any part of the switch so long .as the locking tumbler operates against the moving element thereof.

As many changes could be made in the above construction and many apparently.

widely different embodiments of our invention within the scope of the claims constructed without departing from the spirit or scope thereof, it is intended that all matter contained in the accompanying specification and drawings shall be interpreted as illustrative and not in a limiting sense. lWhat we claim as our invention is:

1. An improved switch lock comprising in combination a turning element operatively connected to the switching mechanism formed with a slot therein, a easing member formed with a laterally extending passageway having an enlarged outer portion with a shoulder at the inner end of the outer p0rtion, a tumbler' reciproeable .in the passageway and having spaced flanges, the innermost one of which is adapted to abut the shoulder when the tumbler is in innermost position, spring means for forcing the tumbler inwardly, and said casing being further formed with a key seat extending across the passageway and so arranged that the key therein may engage the tumbler to move the same, said key seat being further so formed that the key may only be withdrawn when the locking tumbler is in engaged position.

2. An improved switch lock comprising in combination a easing member, a turning element pivotally supported in the same, a vertically extending shaft moving Vwith the turning element and connected to the switching mechanism, said casing having an arcuate slot therein and also being formed with a laterally extending passageway, a laterally extending i'ever connected to the turning member and 'operating in the arcuate slot in the casing member, and a spring actuated sliding locking tumbler mounted in the laterally extending passageway, said turning member being .formed with a slot into which the tumbler isadapted to take,

said casing member being further formed with a key seat extending lacross the passa geway and so arranged that the key there- A1n may engage the tumbler to move the same,

said key seat being further so formed that vthe key may only'be \\,ithdrawn when the locking tumbler is inengaged position.

lnwltness whereof we havehereunto-set our hands in the presence of two witnesses.

lV. E. VVOODHOUSE. THDMAS RATE. Y. Witnesses as to W. E. Woodhouse-r.

E. A. Coi-mn, JOHN THORNTON. -Witnesses as lto T. Bate: D. lV.' REDMAN, A.. RANKI'N. 

